Check for dot being available when building HTML documentation.

This helps with ensuring that the generated CHM always has the inheritance
diagrams as by default Doxygen creates it successfully even if dot is not
found -- but without any graphs.

Closes #15620.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@75095 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Signed-off-by: Marian 'VooDooMan' Meravy <vdm113@gmail.com>

Conflicts:
	docs/doxygen/regen.bat
Fix wxSpinButton default width under GTK+ 3.

The default GTK+2 width is so small as to make the control unusable under
GTK+3, so use larger (but still hardcoded) width there.

Closes #15619.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@75096 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Fix MeasureWidths() in wxSTC in non-Unicode build.

Integer values must be converted to floats instead of just using memcpy().

Closes #15617.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@75097 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Remove accidentally committed testing "rem" from regen.bat.

See #15620.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@75098 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Signed-off-by: Marian 'VooDooMan' Meravy <vdm113@gmail.com>

Conflicts:
	docs/doxygen/regen.bat
Avoid pointer conversions to unsigned long in the samples.

This results in errors when using g++ Win64 builds as sizeof(long) <
sizeof(void*) in Win64.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@75100 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Fix missing semicolon in wxFileName::SetPermissions() documentation.

Closes #15623.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@75101 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
patched for ICC

Signed-off-by: Marian 'VooDooMan' Meravy <vdm113@gmail.com>